To use your new AT&T 3G or 4G phone with an AT&T Microcell, it must be within signal range and added to the approved user list. Note: 2G and non-AT&T devices are not compatible with AT&T Microcell.
To add a device to your approved user list, from the home screen of the device you set up as the AT&T Microcell's primary number, tap the Messages icon. Note: You can also add an approved user by logging in at http://www.att.com/microcell using your myAT&T account information.
Tap the Compose icon to send a message to a new recipient.
Enter the short code 6235 (MCEL) as the recipient of the text message.
Enter ADD 5555555555 (your device phone number) in the message field.
When successfully connected, the cell phone will show AT&T MicroCell or AT&T M-Cell in the notification bar. Note: Depending on the signal strength of the AT&T cell tower, the time for your cell phone to switch to the MicroCell can vary. It may take seconds or up to five minutes.
If you do not see AT&T MicroCell or AT&T M-Cell, turn your mobile device (not MicroCell) off, wait 10 seconds and then turn it back on. Note: Depending on the signal strength of the AT&T cell tower, the time for your cell phone to switch to the MicroCell can vary. It may take seconds or up to five minutes.
To manually scan for the AT&T MicroCell, from the quick settings menu, tap the Settings icon. Note: To access quick settings, swipe down from the Notification bar.